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• W3217222357 abstract "We present a spectroscopic study of Mn-doped Mg2TiO4 as a function of pressure and temperature to check its viability as a red-emitting phosphor. The synthesis following a solid-state reaction route yields not only the formation of Mn4+ but also small traces of Mn3+. Although we show that Mn4+ photoluminescence is not appreciably affected by the presence of Mn3+, its local structure at the substituted Ti4+ host site causes a reduction of the Mn4+ pumping efficiency yielding a drastic quantum-yield reduction at room temperature. By combining Raman and time-resolved emission and excitation spectroscopies, we propose a model for explaining the puzzling nonradiative and inefficient pumping processes attained in this material. In addition, we unveil a structural phase transition above 14 GPa that worsens their photoluminescence capabilities. The decrease of emission intensity and lifetime with increasing temperature following different thermally activated de-excitation pathways is mostly related to relatively small activation energies and the electric–dipole transition mechanism associated with coupling to odd-parity vibrational modes. A thorough model based on the configurational energy level diagram to the A1g normal mode fairly accounts for the observed excitation and emission─the quantum yield─of this material." @default.
• W3217222357 created "2021-12-06" @default.
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• W3217222357 date "2021-12-02" @default.
• W3217222357 modified "2023-10-14" @default.
• W3217222357 title "Understanding the Efficiency of Mn⁴⁺ Phosphors: Study of the Spinel Mg₂Ti_1–<i>x</i>Mn<i>_x</i>O₄" @default.
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• W3217222357 doi "https://doi.org/10.1021/acs.jpcc.1c08006" @default.
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